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Zygo Blaxell and other users have reported occasional hangs while an inode is being evicted, leading to traces like the following: [ 5281.972322] INFO: task rm:20488 blocked for more than 120 seconds. [ 5281.973836] Not tainted 4.0.0-rc5-btrfs-next-9+ #2 [ 5281.974818] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 5281.976364] rm D ffff8800724cfc38 0 20488 7747 0x00000000 [ 5281.977506] ffff8800724cfc38 ffff8800724cfc38 ffff880065da5c50 0000000000000001 [ 5281.978461] ffff8800724cffd8 ffff8801540a5f50 0000000000000008 ffff8801540a5f78 [ 5281.979541] ffff8801540a5f50 ffff8800724cfc58 ffffffff8143107e 0000000000000123 [ 5281.981396] Call Trace: [ 5281.982066] [<ffffffff8143107e>] schedule+0x74/0x83 [ 5281.983341] [<ffffffffa03b33cf>] wait_on_state+0xac/0xcd [btrfs] [ 5281.985127] [<ffffffff81075cd6>] ? signal_pending_state+0x31/0x31 [ 5281.986715] [<ffffffffa03b4b71>] wait_extent_bit.constprop.32+0x7c/0xde [btrfs] [ 5281.988680] [<ffffffffa03b540b>] lock_extent_bits+0x5d/0x88 [btrfs] [ 5281.990200] [<ffffffffa03a621d>] btrfs_evict_inode+0x24e/0x5be [btrfs] [ 5281.991781] [<ffffffff8116964d>] evict+0xa0/0x148 [ 5281.992735] [<ffffffff8116a43d>] iput+0x18f/0x1e5 [ 5281.993796] [<ffffffff81160d4a>] do_unlinkat+0x15b/0x1fa [ 5281.994806] [<ffffffff81435b54>] ? ret_from_sys_call+0x1d/0x58 [ 5281.996120] [<ffffffff8107d314>] ? trace_hardirqs_on_caller+0x18f/0x1ab [ 5281.997562] [<ffffffff8123960b>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 5281.998815] [<ffffffff81161a16>] SyS_unlinkat+0x29/0x2b [ 5281.999920] [<ffffffff81435b32>] system_call_fastpath+0x12/0x17 [ 5282.001299] 1 lock held by rm/20488: [ 5282.002066] #0: (sb_writers#12){.+.+.+}, at: [<ffffffff8116dd81>] mnt_want_write+0x24/0x4b This happens when we have readahead, which calls readpages(), happening right before the inode eviction handler is invoked. So the reason is essentially: 1) readpages() is called while a reference on the inode is held, so eviction can not be triggered before readpages() returns. It also locks one or more ranges in the inode's io_tree (which is done at extent_io.c:__do_contiguous_readpages()); 2) readpages() submits several read bios, all with an end io callback that runs extent_io.c:end_bio_extent_readpage() and that is executed by other task when a bio finishes, corresponding to a work queue (fs_info->end_io_workers) worker kthread. This callback unlocks the ranges in the inode's io_tree that were previously locked in step 1; 3) readpages() returns, the reference on the inode is dropped; 4) One or more of the read bios previously submitted are still not complete (their end io callback was not yet invoked or has not yet finished execution); 5) Inode eviction is triggered (through an unlink call for example). The inode reference count was not incremented before submitting the read bios, therefore this is possible; 6) The eviction handler starts executing and enters the loop that iterates over all extent states in the inode's io_tree; 7) The loop picks one extent state record and uses its ->start and ->end fields, after releasing the inode's io_tree spinlock, to call lock_extent_bits() and clear_extent_bit(). The call to lock the range [state->start, state->end] blocks because the whole range or a part of it was locked by the previous call to readpages() and the corresponding end io callback, which unlocks the range was not yet executed; 8) The end io callback for the read bio is executed and unlocks the range [state->start, state->end] (or a superset of that range). And at clear_extent_bit() the extent_state record state is used as a second argument to split_state(), which sets state->start to a larger value; 9) The task executing the eviction handler is woken up by the task executing the bio's end io callback (through clear_state_bit) and the eviction handler locks the range [old value for state->start, state->end]. Shortly after, when calling clear_extent_bit(), it unlocks the range [new value for state->start, state->end], so it ends up unlocking only part of the range that it locked, leaving an extent state record in the io_tree that represents the unlocked subrange; 10) The eviction handler loop, in its next iteration, gets the extent_state record for the subrange that it did not unlock in the previous step and then tries to lock it, resulting in an hang. So fix this by not using the ->start and ->end fields of an existing extent_state record. This is a simple solution, and an alternative could be to bump the inode's reference count before submitting each read bio and having it dropped in the bio's end io callback. But that would be a more invasive/complex change and would not protect against other possible places that are not holding a reference on the inode as well. Something to consider in the future. Many thanks to Zygo Blaxell for reporting, in the mailing list, the issue, a set of scripts to trigger it and testing this fix. Reported-by: Zygo Blaxell <ce3g8jdj@umail.furryterror.org> Tested-by: Zygo Blaxell <ce3g8jdj@umail.furryterror.org> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com> |
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| inode.c | ||
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